## Base 3 to Integer

Given a string s representing a number in base 3 (consisting only of 0, 1, or 2), return its decimal integer equivalent. This should be implemented directly ...

Given a string s representing a number in base 3 (consisting only of 0, 1, or 2), return its decimal integer equivalent. This should be implemented directly ...

You’re given a string s consisting solely of "(" and ")". Return whether the parentheses are balanced.

Given a singly linked list node, reorder it such that we take: the last node, and then the first node, and then the second last node, and then the second nod...

You are given a string s containing digits from "0" to "9" and lowercase alphabet characters. Return the sum of the numbers found in s.

Given a list of integers nums, return the number of contiguous arithmetic sequences of length ≥ 3.

Given a list of integers nums, return whether you can rearrange the order of nums such that the difference between every consecutive two numbers is the same.

You are given a list of integers nums where each number represents the height in a histogram. Return the area of the largest rectangle that can be formed onl...

You are given a list of integers nums and integers k and target. Consider an operation where we choose an integer -k ≤ e ≤ k and append it to nums.

You are given a string dictionary, representing a partial lexicographic ordering of ancient astronauts’ dictionary. Given a string s, return whether it’s a l...

You are given a list of lowercase alphabet strings words where each string is of the same length. Return whether there’s two strings that differ only in one ...

You are given a list of integers nums, representing a decimal number and nums[i] is between [0, 9].

Given a singly linked list l0 and another linked list l1, each representing a number with least significant digits first, return the summed linked list.